Brake-testing apparatus



Oct. 28, 1930.

H. MORGAN BRAKE TESTING'APPARATUS Filed March l2, 192.7 2 Sheets-Sheet lIIL [NMEA/TOR /7014 diz' i YS BY I /arr I A TTNE oct. 2s,r 1930. H,MORGAN 1,779,945

BRAKE TESTING APPARATUS Filed March 12, 1927 2 Sheets-Sheet 2 D BY#af/"y Morgan LQ Pareil-malv oct. 2s, 193e A'uliu'lan STAT-Es PATENTOFFICE HARRY MoBGAN, oF FLINT, MICHIGAN, AssIGNoa To BRAKE-TESTINGEQUIPMENT CORPORATION, orjsAN FRANCISCO, CALIFORNIA, A CORPORATION orCALIFORNIA BRAKE-TESTING APPARATUS The main objects of this inventionare:

. First, to provide a brake testing means fory which is simple andeconomical in structureand durable in operation.

Objects pertaining to details and economies of my improvements willdefinitely appear from the detailed description to follow. The inventionvis defined and pointed out in the claims.

A structure embod ing the features of my 'invention is clearly ilustrated in the accompanying drawing in which:

Fig. 1 is a perspective view of a brake testing apparatus embodyin thefeatures of my 2o invention, an. automobi e being shown by dottedllilies in operative relation to the apparatus.

. Fig. 2 is a side elevation of one of m improved brake testing units,a' wheel ing shown by dotted lines lin operative relation thereto.

Fig. 8 is a plan view of one of my improved brake testing units, thelevers being partially broken away.

F1 4 is ay detail section on a line correspending to line 4-4 of Fig. 2.

Referring to the drawing, 1 represents an automobile and 2J 2 the rearwheels thereof. As the testing units are duplicates a description of onewill suice.

I provideja baseconsisting of a pair of pedestals 3 having bearings forthe shafts of the drums 4 and 5, these drums being supported in spacedrelation to support a wheel as 2. The drum 5 is provided with a seriesof ratchet teeth 6 formed on the edge of the rim of the drum.

The lever head 7 is pivotally and oscillatingly mounted upon theprojecting end 8 of the shaft for' the drum 5. This ever head member 7is provided with a forwardly projecting arm 9 on which the pawl 10 ismounted by means of the pivot 11 so that the pawl coacts with the teeth6 of the drum 5.

A fluid cylinder designated generally by the numeral 12 is carried bythe lever head. This cylinder com rises an outer shell 13 formed as apart o the head casting and a lining or Cylinder proper :14. Thiscylinder is adapted to contain suitable pressure transmitting Huid, asoil, a plunger 15 being arranged within the cylinder and provided with astem 16 projecting from the c linder. This stem engages the rear side oft e pawl 10.

A spring 17 holds the pawl yieldingly against the plunger 16. Thepressure gage 18 which is shown conventionally in the drawing isconnected to the cylinder'by means of the pipe 19 so that the pressuretransmitted through the levers and the pawl to the drum is indicated onthe gage 18.

To prevent rotation of the drum when the vehicle wheel is positionedthereon, I rovide a ,drum holding brake shoe 2O whic is of tapered crosssection and disposed between the drums to coact with both. This shoe issupported by the vertically reciprocating rod 21 on which is a coiledspring 22 acting to disengage the brake shoe.

The lever 28 pivoted at 24 is provided with 75 an arm 25 connected tothe lower end of the brake rod 21 so that the drums may be easily heldagainst rotation. Skidways or tracks 26 and 27 are provided so that thevehicle may be driven upon the drums.

I also provide a brake setting means comprising a fluid cylinder 28having a plunger 29 adapted' to engage the brake pedal 30. Projectingfrom the end of the cylinder is a sectional screw 31 having a turnbuckle 32. The cylinder is provided with a pressure gage 33. Thisenables the settin of the brakes at any desired pressure so t at theymay be tested to determine their eiiiciency, also for equalizing brakesand for various adjustments which may be required. f

-I have illustrated and described my improved brake testing apparatus inan embodiment which I consider very desirable. I have not attem ted toillustrate or describe various modi cations and adaptations which Icontemplate as I believe this disclosure will enable those skilled inthe art to embody or ada t my improvements as may be desired.

aving thus described my invention what 100 I claim as new anddesire tosecure by Letters Patent is: v

1. In a brake testing apparatus, the combination of a supporting base,drums rotatably mounted on said base in s aced relation toreceive andsupport a w eel, one of said drums being provided with ratchet teeth, alever mountedon an axis coinciding with that of the drum having theratchet teeth, a pawl pivotally mounted on said lever to coact with saidratchet teeth on said drum, a fluid cylinder` mounted on said lever andprovided with a plunger having a projecting stem engaging said pawl. aspring yieldingl supporting said pawl against said stem, an a pressure'gage operatively connected to said cylinder to indicate the pressureexerted on the fluid therein.

2. Ina brake testing apparatus, the combination of a supporting base,drums rotatably mounted on said base in spaced relation to receivelandsupport a wheel, one of said drums being provided with ratchet teeth, alever mounted on an axis coinciding with that of the drum having theratchet teeth, a pawl pivotally mounted on saidlever to coact with saidratchet teeth on said drum, a fluid cylinder mountedon said lever andprovided with a plunger having a projecting cylinder having a plungeroperatively associated with said pawl,

5. In a brake testin a paratus, the combination of a pair o rums mounted1n spaced relation to receive and support a wheel, a lever having a awland ratchet connection to one of said rums, and a pressure gage meanssubject to the thrust of said pawl. 6. An automobile brake testerincluding frames having wheel receiving drums adaptedto receive a pairof automobile wheels at a time, bridge members for permitting the wheelsto be driven up on to said frames, means for holding the wheel receivingdrums stationary while the automobile is driven onto the same, and forcegaging means whereby one of the drums of each frame may be rotated torotate the wheels of the automobile individually and indicate thepressure required to rotate the wheel against its braking action.

In witness whereof I have hereunto set my hand.

HARRY MORGAN.

stem engaging said pawl, a .spring yieldingly supporting said pawlagainst said stem, a

pressure gage operatively connected to said cylinder to indicate thepressure exerted on the fluid therein, a holding brake shoe for saiddrums disposed between them to coact with both, a verticallyreciprocatingsupporting rod for said holding brake shoe, a springarranged on said rod to urge said holdin brake shoe to disengagedposition, and a han lever operatively connected to said rod foractuating said holding brake shoe.

3. In a brake testing apparatus, the combination of drums rotatablymounted in spaced relation to receive and vsupport a wheel, one of saiddrums being provided with ratchet teeth, a lever provided with a pawlcoacting with said ratchet teeth on said drum a fluid cylinder mountedon said lever and provided with a plunger operatively associated withsaid pawl, and a pressure gage operatively connected to said cylinder toindicate the therein.

4. In a brake testing apparatus, the combination of drums rotatablymounted in spaced relation to receive and support a wheel, one of saiddrums being provided with ratchet teeth, a lever mounted on an axiscoinciding with that of the drum having the ratchet teeth, a pawl onsaid lever coacting with the ratchet teeth on said drum, and a fluid.cylinder mounted on said lever and provldedwith means to indicate theprespressure exerted on the Huid sure exertedon thevluid therein, saiduid

